hello,
5 v crimp is a style, of a metal roof panel.
you have different styles of metal roofs which have different looks.
one of them is 5 v crimp and thats the style you see on old southern
farm houses, the country style tin roof.
it is called 5 v crimp, because when you look at the end of the panel it has 5 - 1" Vs bent into it or crimped into it as it goes throught the machine.

I believe its attractiveness is its price. It costs about half of what standing seam or factory-finished metal panels do. Spec-home builders can use it and sell it as a “metal roof” and many buyers can’t distinguish between standing seam, prefinished panels and 5 v crimp. Around here, it’s dismissively called “barn tin”.